Longman Dictionary of Contemporary English homepage

bumpy

 adjective
     
bump‧y comparative bumpier, superlative bumpiest
1 a bumpy surface is flat but has a lot of raised parts so it is difficult to walk or drive on it [= uneven; ≠ smooth]:
a bumpy road
The ground is bumpy in places.
2 a bumpy journey by car or plane is uncomfortable with movements up and down because of bad road or weather conditions [≠ smooth]:
The plane made a bumpy landing.
3

a bumpy ride/time

having a lot of problems for a long time:
Shareholders have had a bumpy ride.
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.
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